Switched-tank DC transformer and voltage ratio switching method thereof

Abstract

A switched-tank DC transformer and a voltage ratio switching method thereof are provided. The switched-tank DC transformer includes an input terminal, an output terminal, 2n inverting switches, 2n rectifying switches, 2n−2 clamping switches, n resonance tanks and n−1 support capacitors. The inverting switches are serially connected in sequence. There is an inverting node between every two neighboring inverting switches. A terminal of the rectifying switch is connected with a rectifying node. A terminal of the two clamping switch is electrically connected with a clamping node. The resonance tank is electrically connected between the inverting node and the rectifying node. The support capacitor is electrically connected between the inverting node and the clamping node. Every support capacitor and every resonance tank is switchable to be in a normal state or a voltage ratio switching state, thus a voltage ratio of the switched-tank DC transformer is allowed to vary correspondingly.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to China Patent Application No. 201811338938.9, filed on Nov. 12, 2018, the entire content of which is incorporated herein by reference for all purposes.FIELD OF THE DISCLOSURE[0002]The present disclosure relates to a switched-tank DC transformer, and more particularly to a switched-tank DC transformer and a voltage ratio switching method thereof.BACKGROUND OF THE DISCLOSURE[0003]For ensuring the performance of the efficiency and quality of supplying power, the voltage regulator module (VRM) with intermediate bus architecture (IBA) is usually utilized for transforming the power. The intermediate bus architecture includes an intermediate bus transformer. Generally, the conventional intermediate bus transformer is a low-frequency switching DC transformer or a full-bridge LLC circuit. The low-frequency switching DC transformer regulates the output voltage by changing the duty ratio, thus the adjustable output ...

AI Technical Summary

Benefits of technology

[0006]An object of the present disclosure provides a switched-tank DC transformer and a voltage ratio switching method thereof. In the switched-tank DC transformer, every support capacitor and every resonance tank is switchable to be in a normal state or a voltage ratio switching state. Accordingly, the voltage ratio of the switched-tank DC transformer is changed at will. When the input voltage varies in a wide range, the range of the output voltage can be limited by adjusting the voltage ratio of the switched-tank DC transformer. Therefore, both the high efficiency of power transformation and the adjustable output voltage are achieved. Moreover, with regard to the voltage regulator module including the switched-tank DC transformer, the efficiency and quality of supplying power thereof are enhanced.

Problems solved by technology

However, due to the high voltage ratio of the low-frequency switching DC transformer, the efficiency of power transformation thereof is low.

In addition, due to the fixed voltage ratio of the full-bridge LLC circuit, the output voltage thereof is not adjustable.

Consequently, neither the low-frequency switching DC transformer nor the full-bridge LLC circuit is able to achieve the high efficiency as well as the adjustable output voltage.

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